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A vehicle with a return-type fuel injection system is being tested with an exhaust gas analyzer and the following results are obtained (AIR pump disabled):
At Idle: At2500 RPM:
CO2 = 8.10 % CO2 = 9.70 %
CO = 10.00 % (pegged high) CO = 8.13 %
O2 = 0.00 % O2 = 0.00 %
HC = 850PPM HC = 530 PPM
l = 0.707 l = 0.769
Which condition would most likely be responsible for all of the readings shown?
A. An open spark plug wire
B. A vacuum leak
C. A restricted fuel filter
D. A leaking fuel pressure regulator diaphragm
Answer: D
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